Grinding machine



May 23, 1933. l v K BOYNTON 1,910,234

GRINDING MACHINE INVENTOR /Mnljggm @aM May 23,-1933. v, K. BoYNToN GRINDING MACHINE Filed Deo. ll. 1930 2" Sheets-Sheet 2 INVENTOR Patented May 23, 1933 Y UNrrED sra'res mfln-'ran- FFICEQ v VEEN K. BOYN'TON, OF MILWAUKEEQWISCONSIN, ASSIGNOR TO PITTSBURGH PLATE j GLASS COMPANY, A CORPORATION 0F PENNSYLVANIA GRINDING- MACHINE Application led December 11, 1930. Serial No. 501,583.

The invention relates to a machine for grinding paint, printers ink, .chocolate and the like, and involves an improvement in the type of machine shown in the patent to S..

Bramley-Moore No. 1,692,884. In apparatus of this type, a fixed cylinder is employed in which is mounted a rotating arm provided withV grinding elements in the form of spring pressed bars which engage the interior roughened surface of the cylinder. The object of theV present invention is to increase the capacity and efliciency of the machine. Briefly stated` this object is ac- Complished by the addition of agitators mounted to move with the arm. These agitators prevent the formation of dead pockets in the corners of the cylinder and scrape the end of the cylinder free from material which would otherwise collect thereon.

This improvement permits a stier paste to be ground, reduces the power required to operate the machine, and increases its capacity or output. One embodiment of the invention is shown in the accompanying drawings, wherein:

Figure 1 is a longitudinal section through a machine equipped with the improvement particularly designed for the grinding of paint. And Fig. 2 is an end elevation.

Referring to the drawings, 1 and 2 are standards or legs, upon which are supported the casing or cylinder 3 and the casting 4 which acts as a support for the driving mechanism and as a closure for the left hand end of the cylinder. The other end of the cylinder is closed by the header 5 provided with the discharge outlet 6. The discharge outlet is closed by a gate 7 having a handle 8, such gate being secured in position by a bar 9 provided with a clamping screw 10.

The bar 9 is secured to the header by means of the stud bolts 11. An inlet 12 is provided at the left hand end of the cylinder, such inlet being closed during the operation of the machine by the plate 18. A cooling chamber 14 is provided in the wall of the cylinder having the connections 15 and 16 for providing a circulation of water.

Carried in the bearing 17 at the end of the casing is a hollow shaft 18 driven from the shaft 1,9 by the pinion 20 and spur `gear 21, the shaft 19 being driven from. a motor which is not show-n. The shaft 18 has lreyed to its inner end the arm 22, such arm being held against endwise movement on the shaft by the nut litting in a recess in the arm. The arm 22 has a slot 124 in its end in which is slidably mounted the lug 25 on vthe member4 2,6.v The member Y 26 is provided with leaf springsv27 which carry the lbars 28 engaging the roughened inner'surface of the casing, the construction here following that of Vthe patent heretofore referred to, The member25 is adjusted radially with respect to the easing by means of the rod 28a the cone end 29 of the rod 30, a ball 31 4beT ing interposed between such end 29l of the rod and `shaft as illustrated. Theleft hand end of the rod `=is swivelled to the hub 32 which latter has `a screw engagement 33 with the sleeve member 34. The hub 32 is provided with a hand' wheel 34?l for rotating it and giving the rod 30 and con@ end an adjustment in and out to regulate the pressure 0f the Vgrinding rods v2.8 01.1 .the surface of the .casing The casting ,4 acts as a .casing for the gears 20 nand 2l, the outer-side of. the cavity being closed byav cov-er which is bolted in .position -andcarresj .the sleeve member 34 rigidly Secured thereto. A suitablefballbearing 3,5 is pro- Y vided for taking the end `tlirnst of -the shaft 18 Yand other ball `bearings 36 and 37 YSwivel the .end `of the rod .30 with respect to the plate 38 clamped to the end of thehub by the ycap 89. v `Bolted `to the hub of the arm 22 so that it rotates therewith and with the shaft 18 is the hub 40, such hub being concentric with the. shaft and being provided .W'thfour agitator blades 41, 42, 43 and 44 Varranged staggered relation, as shown in Fig. 1, with the blade 44 in close proximity to the end of the casing so that it acts as a Iscraper therefor. A scraper for the other' end .of the casing is provided in the form of the blade 45 secured at its inner end to the of the arm 22 by means of the bolts 46. In operation .thecasing is partially 'filled with aimiXture of the material to be ground SL90 and liquid through the opening l2, after which the motor driving the shaft 19 is started, thus causing the arm 22 to rotate carrying the grinding elements Vover the roughened surface of the casing, the material to be ground passing between such surface and the-grinding elements. After the operation is completed, the gate 7 is removed allowing the mixture to flow through the outlet opening 6. I have found that the use of agitating and scraping blades 4l, 4:2, 43, 44' adds greatly to the capacity and efficiency of the machine. As appli-ed to the grinding of paint, the output of the machine is increased over 30 per cent and the power required to drive 'the machine with the increased capacity is reduced as compared with that required to drive it withoutthe agitators. The use of the agitators permits the grinding of a stiffer paste than could be ground wihout them, thus increasing the amount of material ground at one time and constituting a contributing factor to the increased output of the machine. The etliciency of the agitators is believed to be due to the fact that they constantly throw the material outward against the grinding face of the casing, thus keeping the grinding elements supplied with the amount of material necessary to give the best results, and prevent the formation of dead pockets in which large masses of the material would otherwise collect and remain for considerable periods before becoming loosened and passing between the grinding surfaces of the machine.

What I claim is:

l. In combination in a grinding machine,

a casing or drum having a grinding surface therein, a bearing at one end of the casing concentric therewith, a shaft carried by said bearing projecting into the casing and terminating intermediate the ends of the casing, means for driving the' shaft, an arm carried by the inner end of the shaft,'closure walls at the ends of the casing, a grinding element carried by the arm and engaging the grinding surface of the'casing, and an agitating member carried by the end of the shaft, the axes thereof being arranged in alinement, such agitator including a blade which is transverse to the axis of rotation of the arm and lies adjacent the end of the casing and acts asa scraper for the closure wall remote from said bearing.V

Y 2. In combination in a grinding machine, a casing or drum having a grinding surface therein, abearing at one end of the casing concentric therewith, a shaft carried by said bearing projecting into the casing and terminating intermediate the ends of the casing, means for driving the shaft, an arm carried by the inner end of the shaft, closure walls at the ends of the casing, a grinding elementcarried by the arm and engaging the grinding surface of the casing, a hub supported in alinement with the end of the shaftand mounted to turn therewith, and a plurality of laterally projecting agitating blades carried by the hub, one of which lies closely adjacent to the closure wall of the casing remote from said bearing and acts as a scraper therefor.

3. In combination in a grinding machine, a casing or drum having a grinding surface therein, abearing at one end of the casing concentric therewith, a'sliaft carried by said bearing projecting into the casing and terminating intermediate the ends of the casing, means for driving the shaft, an arm carried by the inner end of the shaft, closure walls at the ends of the casing, a grinding element carried by the arm and engaging the grinding surface of the casing, a hub supported in alinement with the end of the shaft and mounted to turn therewith, and a plurality of laterally projecting agitating blades carried by the hub and arranged in staggered relation longitudinally :of the hub with one of such blades closely adjacent the end of the closure wall of the casing remote from said bearing so that said blade acts as a scraper for such wall.

In testimony whereof, I have hereunto subscribed my name this 3rd day of December, 1930.

' VERN K. BOYNTON. 

